A SELF-CLOSING ARRANGEMENT

Abstract: This invention relates to a self-closing arrangement which enables flowable substance present in a container to be dispensed therefrom. The arrangement includes a flexible diaphragm having an outlet aperture, and a preferably conical stud which is fixed in relation to the diaphragm and which is located inwardly thereof, wherein the conical stub so coacts with the outlet aperture that the diaphragm in its normal position will rest with its outlet aperture resiliently in abutment with the stud and therewith close the container, and so that upon application of a pressure difference across the diaphragm to dispense substance from the container, the diaphragm will resiliently move away from the stud and therewith expose the outlet aperture. The diaphragm (3) includes at least two deformation zones (5, 6) which are spaced at different distances from the outlet aperture (4), wherein these deformation zones (5, 6) extend around the outlet aperture (4) and have the form of folds which include weakenings (7) in the diaphragm thickness, thereby enabling the remainder of the diaphragm (3) to have an uneven thickness without detrimentally affecting the mutual coaction between stud (8) and diaphragm (3) as the closure arrangement opens and closes.

Description: A SELF-CLOSING ARRANGEMENT TECHNICAL FIELD The present invention relates to a self-closing arrangement which will allow a flowable substance, such as flowable foodstuffs of different kinds, to flow from a container in which they are contained, wherein the arrangement includes a flexible diaphragm having an outlet aperture, and a preferably conical stud or pin which is fixedly mounted in relation to the diaphragm and located inwardly thereof, wherein the stud so coacts with the outlet aperture that when the diaphragm occupies a normal position the outlet aperture will rest resiliently against the stud and therewith seal the container, and wherein when a pressure difference is applied across the diaphragm to discharge the content of the container, the diaphragm is distanced from the stud and therewith expose the outfeed aperture. DESCRIPTION OF THE PRIOR ART Many different solutions concerning self-closing devices for discharging flowable substances from containers of different kinds are known to the art, wherein a typical device will include a resilient diaphragm which seals the outfeed aperture of the device in accordance with the preamble of the following Claim 1. One such construction is disclosed in U.S. Patent Specifica- tion 4,141,474, which teaches a discharge arrangement that can be readily manufactured and used. However, this known arrange¬ ment is encumbered with certain drawbacks, primarily with regard to the manufacture of the arrangement. The main difficulty in manufacture resides in injection-moulding the closure diaphragm included in the arrangement, since it has been found difficult to obtain a diaphragm of uniform thick¬ ness. Uniform diaphragm thickness is important in order for the diaphragm to move correctly in relation to the stud coacting therewith, such that the discharge aperture will be opened and closed reliably when the arrangement is active. Another construction is disclosed in U.S. Patent Specification 4,699,300. SUMMARY OF THE INVENTIVE CONCEPT An object of the present invention is to avoid the aforesaid drawbacks associated with self-closing closure arrangements for containers and other vessels. In accordance with the inventive concept, this object is achieved by providing the diaphragm with at least two deforma¬ tion zones which are located at different distances from the diaphragm outfeed aperture, in mutually accordance with the characterizing clause of the following main Claim. These deformation zones enable movement of the diaphragm to be controlled so that its outfeed aperture will always move symmetrically and uniformly in relation to the stud coacting with the diaphragm. By designing the diaphragm in this way, there is obtained a self-closing closure arrangement which is easy to manufacture in view of the fact that the thickness of the diaphragm is no longer a critical manufacturing parameter, either with regard to its thickness or with regard to a uniform thickness across the diaphragm. An inventive closure arrangement can also be produced cheaply. Furthermore, there is obtained a self-closing closure arrange¬ ment which is both reliable in operation and has a long useful life span. BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be described in more detail with reference to the accompanying drawings, in which Fig. 1 is an axial section view of an inventive self-closing closure arrangement mounted on a container, and shows the arrangement from one side with the diaphragm in its rest position, i.e. with the arrangement closed; Fig. 2 illustrates the closure arrangement of Fig. 1 in an initial opening stage; Fig. 3 illustrates the closure arrangement of Fig. 1 when fully opened; Fig. 4 is an axial sectional view of an inventive closure arrangement combined with a metering or dispensing device in the form of a dispensing container or dispensing chamber fitted to a container, the the closure arrangement being shown in closed state; Fig. 5 illustrates the assembly of Fig. 4 in a substance metering or dispensing state; Fig. 6 is an axial section view of an inventive self-closing closure arrangement mounted on a metering or dispensing device with a dispensing limitation in the form of a dispensing chamber in a filling position with the diaphragm in its closing position; Fig. 7 illustrates the assembly of Fig. 6 in a metering or dispensing state; Fig. 8 is an axial section view of an inventive self-closing closure arrangement combined with an air-suction dispensing container with the diaphragm in a filling position; and Fig. 9 illustrates the assembly of Fig. 8 in a metering or dispensing state, DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION Figs. 1-3 illustrate a preferred embodiment of an inventive closure arrangement which includes a main body 1, seen in section, onto which there is fitted a container 2 which contains a flowable substance. In the illustrated case, the container is compressible, i.e. can be compressed to discharge its contents, and may, for instance, have the form of a conventional tube comprising slightly resilient walls. The main body 1 is preferably made of a plastic material and has the form of an annulus which is pressed or welded over the discharge orifice of the container 2. The main body also includes a diaphragm 3 which is moulded or injection-moulded integrally with the main body 1 and which has a central, circular discharge aperture 4. The diaphragm 3 includes deformation zones in the form of circular folds 5 and 6 located at mutually different distances from the aperture 4 and concentrically therewith. The folds 5, 6 are orientated so that the diaphragm will have a conical shape, with the narrow part of the diaphragm facing in the discharge direction in the proximity of the aperture 4, but has in its entirety, obtained immediately in conjunction with manufacture, a slightly conical shape with the apex of the cone facing inwardly towards the container 2. As illustrated in Fig. la, the folds include weakenings 7, preferably in the form of grooves. The closure arrangement also includes a central stud or pin 8 which has a conical part 9 intended for coaction with the aperture 4 in the diaphragm 3. The stud 8 is held centralized by a slightly conical ring 10, with the aid of spoke-like arms 11. The annular main body 1 is provided in the proximity of the diaphragm 3 with an internal groove 12 having a shape comple¬ mentary to the outer contours of the slightly conical ring 10. When mounting the pin 8, the ring 10 is pushed into the groove 12 from that side of the main body, which is intended to face in towards the container 2. In the constructive design of the closure arrangement, the groove 12 is positioned so that the stud 8 will lie against the aperture 4 and move the diaphragm into abutment with the stud 8 with a predetermined degree of tension. In its normal position, the diaphragm will close the container as illustrat¬ ed in Fig. 1. When the internal container pressure is increased, for instance by compressing the container, the diaphragm 3, and therewith the aperture 4, will move away from the conical part 9 of the stud 4, as illustrated in Figs. 2 and 3, and sub¬ stance contained in the container will be pressed out. As soon as the container pressure is normalized, the tension in the diaphragm will cause the diaphragm to return to the position shown in Fig. 1, therewith reclosing the container. As the internal container pressure increases, the diaphragm will be deformed primarily uniformly in the folds 5, 6, while remaining parts of the diaphragm will remain essentially unaffected, meaning that the aperture 4 in the diaphragm will be displaced generally rectilinearly and symmetrically in the substance discharge direction to and from the stud 8, and will always return to the same position of origin, which is essen¬ tial to reliable long-term functioning of the arrangement, and also to avoid the closing movement of the diaphragm being obstructed by dry, caked substance. Figs. 4-9 illustrate different constructions in which the closure arrangement illustrated in Figs. 1-3 has been combined with different types of metering or dispensing containers. These combinations enable the inventive closure arrangement to be used together with other standard types of containers, for instance non-compressible containers. In the case of the embodiment illustrated in Figs. 4 and 5, the closure arrangement 1 is mounted at one end of a prefera¬ bly cylindrical dispensing chamber 13 which has deformable walls and which is provided at its other end with an annular part 14 which includes a check valve. The inner surface of the annular part 14 is provided with internal screw threads 15 for connection to a selected standard container. The annular part 14 includes an inner flange 20 which carries a check valve 16 provided with slide pins 17. Located in the proximity of the slide pins 17 are stop means in the form of hooks 18, and a sealing surface 19 which limits movement of the check valve 16 between the open position shown in Fig. 4 and the closed position shown in Fig. 5. When in use, the assembly is intended to be positioned generally vertical, as illustrated in Figs. 4 and 5. In the starting or normal state of the assembly shown in Fig. 4, the check valve 16 is open and the closure arrangement l is closed, wherewith flowable substance is able to flow into the dispensing chamber 13 under the force of gravity, until the dispensing container is full. When substance is to be dispensed, the user squeezes the walls of the dispensing container, either directly or indirectly, as indicated by the arrows 21 in Fig. 5, so as to increase the pressure in the dispensing container in relation to ambient pressure. The check valve 16 is herewith pressed upwards and closes the inlet from the substance container, so as to enable the pressure in the dispensing container to rise sufficiently for the diaphragm 3 to open and for the content of the dispensing chamber 13 to be pressed out through the discharge aperture 4. When the pressure returns to its normal level after use, the check valve is again opened and the diaphragm 3 is again closed. Figs. 6 and 7 illustrate a variant of the embodiment illus¬ trated in Figs. 4 and 5, wherein the difference between the two embodiments lies mainly in the fact that the check valve 16' is provided with an elongated, tubular body which overlaps and surrounds the stud 8, and the movement of which is controlled or guided by the slide pins 17' and by the stud 8. When the check valve is in its normal, open position, the lower end of the body rests on the arms 11, meaning, among other things, that the hooks 18 mentioned with reference to the preceding Figures are not necessary, which may be an advantage from the aspect of manufacture. Apart from this difference, the arrangement works analogously with the arrangement illustrated in Figs. 4 and 5. However, an important function of the body 22 is that of providing a dispensing or metering limitation. As evident from Fig. 7, the body 22 limits the extent to which the dispensing chamber is compressed, therewith also limiting the amount of substance that can be dispensed from the dispensing chamber in a definable fashion. Figs. 8 and 9 illustrate a further variant, including an air- suction container. In the case of this embodiment, the container 13, which has been constructed essentially in the same way as the aforedescribed dispensing chambers, is provided with an inventive closure arrangement 1, 1' at both ends thereof, wherein one arrangement, 1, works in the same manner as in the aforedescribed embodiment and need not therefore be described in greater detail, whereas the other arrangement functions as an air-suction check valve. Seen constructively, the sole difference with this variant is that the container walls will preferably be highly deformable elastically, and the stud 8' is attached to a disc 23 provided with air holes 24 instead of arms 11. Fig. 9 illustrates that the valve 1' is closed in the dispens¬ ing state of the assembly when the walls of the container 13' are deformed elastically by the user, and shows that the closure arrangement 1 is opened as a result of the higher internal pressure, wherein substance is dispensed. Immediately the user removes the force acting on the container 13, the container pressure will fall and therewith cause the closure arrangement 1 to close. Because the container walls are elastic, the walls will strive to retake their original form, therewith causing the pressure in the container to fall further, wherein the valve 1' is opened and air is able to flow into the container and equalize the container pressure so that the valve 1' is again closed. It will be understood that the described and illustrated embodiments of the invention can be modified in many ways within the scope of the following Claims. For instance, the pressure difference across the valve can be achieved in ways other than by deforming the walls of the containers or chambers. For instance, this pressure difference may be achieved alternatively with the aid of a displaceable plunger or like device.

Claims: CLAIMS 1. A self-closing arrangement which permits a flowable substance present in a container to be dispensed therefrom, wherein the arrangement includes a flexible diaphragm having an outlet aperture, and a preferably conical stud which is fixed in relation to the diaphragm and which is located inwardly thereof, wherein the conical stud so coacts with the outlet aperture that the diaphragm in its normal position will rest with its outlet aperture resiliently in abutment with the stud and therewith close the container, and so that upon application of a pressure difference across the diaphragm to dispense substance from the container, the diaphragm will resiliently move away from the stud and therewith expose the outlet aperture, characterized in that the diaphragm (3) includes at least two deformation zones (5, 6) which are spaced at mutually different distances from the outlet aperture (4), wherein these deformation zones (5, 6) extend around the outlet aperture (4) and have the form of folds which include weakenings (7) in the diaphragm thickness, thereby enabling the remainder of the diaphragm (3) to have an uneven thickness without detrimentally affecting the mutual coaction between stud (8) and diaphragm (3) as the closure arrangement opens and closes. 2. An arrangement according to Claim 1, characterized in that the weakenings (7) are in the form of grooves. 3. An arrangement according to Claim 1 and 2, characterized in that the diaphragm (3) is circular; and in that the outlet aperture (4) is in the form of a centrally positioned circular hole (4). 4. An arrangement according to any one of the preceding Claims, characterized in that the deformation zones are disposed as concentrical circles having a centre in the outlet aperture (4) .

Inventors: NILSON BILLY, NILSON, BILLY
Applicants: NILSON BILLY, NILSON, BILLY
Application year: 1994
Main classification: B65D47
IPC codes: B05B11, B65D35, B65D47, B65D83